Manually-portable circular saw



A. P. SMITH` MANUALLY-PORTABLE CIRCULAR SAW 2 SHEETS-SHEET 1 Filed Nov. l0, 1948 562 fm2/2 A April 2l, 1953 A. P. s MlTH MANUALLY-PORTABLE CIRCULAR -SAW 2 sfmETsfsnEET 2 Filed Nov. 1o, 1948 IN VEN TOR. v .1v/wg 9m im Patentecl Apr. 21, ,i 1953 4MANUALLY-PORTABLE CIRCULAR SAW Albert P. Smith, Ava, Mo., assignor, by mesneassignments, to Barker Saw Company, Springfield, Mo., a corporation of Missouri I Application November 10, 1948, Serial-No. 59,280

12 claims. (c1. 143-44) t, This invention relates to a saw, and more particularly'to a manually-portable circular saw.

The object'of theinvention is to provide va circular' saw which is power operated, is portable, and vwhich is particularly adaptedA for cutting trees or logs.

Another" object 'of the invention is to provide a power-operated circular saw having structural features which render it readily adjustable, easy moving, and positive in operation to adapt the same to work of different kinds.

y' Still another object of the invention is to provide a portable'saw embodying an annular saw, a power-driven'friction-driving mechanism for rotating the circular saw at high speed, and a manually-operable means for controlling the rotation of the annular saw by the driving mechanism . A further object of the linvention is to provide a manually-portable circular saw which is extremely 'simple and inexpensive to manufacture.

Other objectsand advantages will be apparent during the coursel of the following description.

In the accompanying drawings forming a part of this application, and in which like numerals are employed to designate like parts throughout the same.

Figure 1 is a perspective View showing one side of the saw, and illustrating' the use of the same, according to the present invention;

Figure` 2 is a perspective View of the saw showing the opposite side thereof;

Figure 3 is an `enlarged sectional view taken on the line 3'-3 of Figure 1;

` Figure 4 isan enlarged sectional view on the line 4-"4'of'Figure 1;k Y

t Figure' is an enlarged sectional view takenV on the line 5-5'of Figure l;

Figure 6 is an enlarged sectional View taken on the line Ii-S of Figure l.

Referring in detail to the drawings, the numeral I0 designates an annular saw provided with a plurality of spaced, cutting teeth II on its outer periphery. A portion of the saw I0 is enclosed and rotatably supported in an arcuate semicircular housing I2 which serves to protect strips I6' extend between the support member I5 and flange I4, for maintaining the parts in assem- .bled relation. Securedv to the exterior surface of the support member I 5 and flange- I 4, as by welding, is a plurality of spaced, radially-disposed straps I 'I for a purpose to be later described. Arranged in spaced, parallel, relation with respect to the ange I4 is a removable arcuate plateV I8 having a' plurality of radial strips I9, Figure l, extending therefrom, there being a bolt-and-nut assembly 9 for releasably'securing the strips I 9 to the fiat portion of the support member I'5. The support member I5 has its inner position enlarged as at 20 for reinforcingv or strengthening the latter. l

Projecting downwardly, or formed integral with plate I8 is a plurality of strips 2I which are arranged in opposed, aligned relation with respect to the straps I'I. Extending between the pairs of strips I'I is a-bo1t 22 having a castle nut 23 threaded on an end thereof. The bolts 22each rotatably supports a roller bearing 24v which is in engagement with the inner edge of the saw I0 for rotatably supporting the latter. Arranged adjacent the bolts 22 and 9 and secured to the correspondingrstraps are rivets 25 which each supports a small fiber disc 26, Figure 4, for guiding the saw I0 in the housing I2.

Projecting from one end of the housing I2, or formed integral therewith, is a substantially V-shaped frame 28. Arranged on onefside'of theY frame 28 and secured thereto is a plate member 29. A hollow casing 30 is secured to the plate member 29 by bolts 4 and rotatably supports a drive roller'3l which is arranged in frictional engagement vwith the side or face of the annular saw I0 for rotating the latter. A flexible cable 32 connects the roller 3| to a source of power. A suitable lubricant fitting 6 is carried by the housing to facilitate feeding lubricant to the cable bearing (not shown) within the housing.

Arranged on the other side of the frame 28 and projecting therefrom are a pair of spaced, apertured lugs 33 and a pin 34 extends therebetween for pivotally supporting a T-shaped crank or bar 35. The free` end of the bar 35 carries a rotatable collar 36 which is adapted to be moved into and out of contact with the saw I0 for selectively causing theroller 3| to rotate the saw Ill.

For causing pivotal movement of the bar 35, a manually-operable means is provided and comprises a lug 31 which is secured to the frame 28K. A Lpin 38, Figure 5, pivotally supports a link 39 on the" lug 31,- and one end `of the link 39 is ar.-

ranged in engagement with the bar 35. Connected to the other end of the link 39 is a cable 40 which is trained under a guide member 4| and is connected to an actuating lever 42. The lever 42 is pivotally connected to the support member I5, as at 43, Figure 2. A handle 44 projects outwardly from the casing I3 so that the user can manually move the lever 42 toward the handle 44 to pivot. the. bar 35 thus moving the roller 3,6 against the saw l so thatthe, saw will be positively driven by the friction roller 3l. A rod 1 carrying a roller bearing 24 projects from the frame 2t for additionally guiding and supporting the saw I0.

Pivotally connected to the. frame. 28. by a pin 45 is a support arm 46 and the arm 4,6 terminates in a log-engaging hook 41. A spring' metal finger 48 projects from the support arm 46 and, is adapted to engage the housing |2- inA orderV to releasably maintain the arm 46 in its raisedA po sition, Figure 2. The frame 28 dependingly carries a hook 49 for engagement with the.. support arm 46 to limit downward movement. of the lat.- ter- A coil spring 52` connects the' fra-me 2.8 to thev arm 46 for urging the hook. into engagement with the log to be sawed.

Projecting from one end of the housing II is a iirst handle 50, there being a second handle 5]', Figure 2,( arranged adjacent the other end of the housing. |21 whereby the entire saw assembly can be moved as, desired.

In use, the device is arrangedA so that the circular saw lll is in engagement with the log A or other timber to be cut. Then the friction roller 3l is electrically actuated. The saw Ill will not rotate, however, untilY the lever 42 is moved toward the handle. 44. Moving the lever 42 causes the link 3S! to pivot to thereby move the bar 3.5 and cause. the roller 3B to be moved from its` dotted line position oi Figures. 3 and 5 to the solid line so that it forces the saw .lo against. the rotating,v roller 3i to thereby rotate thesaw l0., When the. lever 4.2V is released, the saw i0' will stop rotating..

AS. many embodiments may be made, of this inventive concept, and as many modifications may be made in the.. embodiment hereinbef'ore shown` and. described, itis to be understood; that all matter herein is to. be interpreted merely as illustrative and notin a limiting sense.

I claim;

1. In a circular. saw an arcuate housing an annular saw provided with. a plurality of cutting teeth on.. its outer periphery rotatably supported by said housing, a frame. secured to one end of said housing, a plate member arranged on one sideA of," said frame land secured thereto, a driving roller supportedl by said plate member and frictionally engaging said annular saw, az bar arranged on the yother side of, said frame and having one end pivotally connected thereto-aroller rotatably mounted on the other endI ofsaid bar Iand mounted for moven'i'enty into and' out of frictional engagement with said sawupon' pivotal movement of said bar, manually-operable means for causingy pivotalmovement of said bar, a. support arm pivotally connected to one end of said frame, and a log-engaging hook arranged on one end of said arm for steadying said sawl during use. i `f 2. InY a circular saw, an arcuate housing, an' annular saw provided with a plurality of' cutting teeth on its outer periphery rotatably supported bysaid' housing, a frame secured to one endy ot` saidA housing, a plate memberY arranged on'. one side of said'frame 'and' secured thereto, adriving roller supported by said plate member and frictionally engaging said annular saw, a bar arranged on the other side of said frame and having one end pivotally connected thereto, a roller rotatably mounted on the other end of said bar and mounted for movement into and out of frictional engagement with said saw upon pivotal movement of. said bar, manually-operable means for causing. pivotal movement of. said bar, a support arm pivotally connected to one end of said frame, a log-engaging hook arranged on one end of said arm for steadying said saw during use, andi a spring finger secured to said support arm for engagement with said housing to hold said Support armV immobile, in its raised position.

3'. In. a circular saw, an arcuate housing, an annular saw provided with a plurality of cutting teeth on its outer periphery rotatably supported by said housing, a frame secured to one end of said housing, a plate member arranged on one side of said housing and secured thereto, a driving roller. supported' by said plate vmember and irictionally engaging said. annular saw,l a bar arranged on the other side of said frame andhaying one end pivotallyconnected thereto, aroller rotatably mounted on the other end of said bar and mounted for movement into and out of frictional engagement with said' sawA upon pivotal movement of said bary manually-operabe means for causingpivotal movement. of` said bar, a support arm pivotally connected. to' one end' of' said frame, a log-engaging hook arranged on one end of said arm for steadying said saw during use, a spring linger secured to said .support arm for engagement With said housing to hold said supportY arm immobile in its raised. position, and a hook dependingly carried by said frame for engagement with said support arm to limit down.-` Ward movement of the latter.

e, In a portable power-driven circular saw@ a housing,1 an annular saw rotatably supported by said housing, electrically-driven means continuously operable for rotating said saw includingV a smooth friction roller engaging said sav/, and manually-operable vmeans varying the pressure between saidAv friction roller and said saw for controlling the rotation of saidv saw by said electrically-driven means.

5. In a circular saw, an arcuate housing comprising a saw gu-ard an annular saw having cutting teeth on its outer periphery and rotatably supported by said housing, a plate member sup ported by said housing; a driving roller journaled on saidplateior rotation about a stationary axis and engaging one side ofsaid saw, a bar pivoted upon saidY plate upon the other side of said saw for movement towards and from said saw and an idler roller rotatable on said bar and engaging. the otherY side osaid saw,4 means. controllably pressing said idler roller against said saw to vary the frictional driving engagement. of the driving roller against the saw.

5.. The combination of claim 5 wherein said bar comprises a T-shaped member whose headV end' is pivoted upon said plate, said. idler roller being iournaled upon the end. of. the, T`shaped member opposite the headed end.

7'. The combination of claim 5 wherein v said plate. member isprovided with an aperture, said driving roller extending through said' aperture for engagement withsaid saw,

8. In a circular saw, an arcuate housing com-1 prising a saw guard, an annular saw having outting teeth on its outer periphery and rotatably, supported by said housing, means for rotating said annular saw, said housing including a cylindrical outer casing partially surrounding and enclosing the saw teeth, an annular inwardly extending flange on said outer casing, an inner arcuate support member disposed in adjacent, spaced relation and rigidly connected to said flange, a removable arcuate plate disposed parallel to and mounted upon said arcuate support member for housing said annular saw therebetween.

9. The combination of claim 8 including fastening members extending between said removable plate and said arcuate support, rollers journaled on said fastening members and rotatably supporting said annular saw.

10. The combination of claim 8 including saw guide members secured to the adjacent surfaces of said arcuate support member and said arcuate plate for frictionally engaging opposite sides of said Iannular saw.

11. A combination of claim 8 including straps rigidly connecting said arcuate flange and said arcuate support member,

l2. The combination of claim 8 including straps rigidly connecting said arcuate liange and said arcuate support member, strips connected to said arcuate flanges and to said arcuate support member in parallel relation to said straps, saw guide members engaging opposite sides of said annular saw and carried by said straps and strips.

ALBERT P. SMITH.

References Cited in the le of this patent UNITED STATES PATENTS 

